Fig. 5From: Rapidly progressed neuroendocrine carcinoma in the extrahepatic bile duct: a case report and review of the literatureMicroscopic findings of the resected specimen with Hematoxylin-Eosin (HE) staining. a An NEC lesion was observed below the submucosal layer (b). An adenocarcinoma lesion was detected in the surface layer (c). The tumor partly showed squamous cell carcinoma (d). b NEC cells were dysplastic cells with a high N/C ratio and granular hyperchromatic irregular-shaped nuclei. c Adenocarcinoma lesion. d Squamous cell carcinoma lesionBack to article page